PAC17X0 High-Side Current Sensors Evaluation Board User’s Guide
DS50002367A-page 40
2015 Microchip Technology Inc.
5.4
MOMENTARY PULSE CURRENT SOURCE (DURATION) – ROTARY SWITCH 2
Rotary Switches 2 and 3 can be used to generate current spikes of varying amplitude
and duration. To demonstrate duration changes, complete the following steps:
1. Turn all rotary switches to the “0” position.
2. Ensure J15 is open. This increases pulse width so the demonstration is easier to
see.
3. Start the V
SENSE
range plot used in the previous demonstration.
4. Turn Rotary Switch 2 to position “F” (highest level of pulse).
5. Turn Rotary Switch 3 to position “F” and press Switch 4 (Pulse Trigger button) to
send the pulse.
6. Turn Rotary Switch 3 to position “E” and press Switch 4 (Pulse Trigger button) to
send the pulse.
7. Continue turning Rotary Switch 3, one position at a time, and pressing Switch 4.
Observe the plot (
).
FIGURE 5-5:
Momentary Pulse Duration Plot.
8. After experimenting, stop the plot.
5.5
10 Hz PULSE TRAIN CURRENT SOURCE – ROTARY SWITCH 5
Rotary Switch 5 can be used to introduce noise (see
Section 3.6.2 “10 Hertz Current
). The evaluation board with the Chip Manager tool does not demonstrate the
PAC1710 and PAC1720 devices’ ability to attenuate circuit noise because the maxi-
mum update rate of the Chip Manager is limited to 4 Hz. To see this feature, connect
an external SMBus master to read the device quickly enough to properly see the results
of the injected 4 Hz noise.
